Sign up as a blacksmith's apprentice and work my ass off to become really good (no internet etc to distract me). Having got my master stripes, seek work under one of the great engineers of the day, in any capacity. Use the tools then sneakily at my disposal, and my learned crafting skills to create, in no particular order:
Electric bulbs, motors and other simple devices, powered off a small generator run off a waterwheel or simple early steam engine. Demonstrate that there's no need for the large, heavy, maintenance-intensive, energy-sapping and dangerous belt-and-shaft arrangements that dominate the power delivery systems of the day. Nor candles or oil/gas lamps, which give off a poor light, run out in mere hours, are smokey and a fire risk.
Introduce a number of simple but crucial early mods to steam engines ahead of their time (automatic valves & etc) but then re-focus them as generators using as much renewable fuel as possible unless coal is the only option, instead of as direct-action prime movers in pumps, machinery, locomotives etc.
Develop simple batteries too. Muse out loud about the amount of charge Nickel and Lithium seem to have, they might make good electrolytes... and let other researchers' curious nature take over.
Get telegraphs and radio up and running ASAP also. Radio is simple as heck once you've electricity, wires, and the methods for creating lightbulbs which can also be used for making tubes. Make sure to invent the microphone, loudspeaker and some kind of modulation/demodulation, tuning and heterodyning devices along the way.
Perhaps, should any of this have any impact, get the design for a simple diesel engine on the go. Have it run off vegetable oil. Efficiency and longevity wouldn't be all that, but my 4-litre, 10 horsepower monster would be the first internal combustion engine any of them will have ever seen, by a matter of 50+ years. The power-to-weight and power-to-volume ratios, and thermal efficiency, will knock steam engines of they day out of the park.
Semiconductors. Once we have electricity, semiconductors as soon as possible. Maybe make a simple computer with relays as a demonstration of the concept of near-instant calculation far quicker than any man with an abacus or pascal's bones could manage, but then move immediately to transistors and don't even bother with tubes, and focus entirely on in-house benefits - how much quicker new designs could be worked out, perfected and drafted. In fact, move to transistorised radio ASAP also. I don't know jack about mosfets, but i could probably figure out silicon-doping.
Use this to improve the efficiency of the electric motors, steam and diesel engines.
"Invent" the safety bicycle, short circuit all that hobby horse and penny farthing nonsense. Put springs on it, too. Attempt to motorise them as soon as it's practical, but hold off on applying motors to carriages. Take the evolution of road transport in an entirely new and weird direction - sell motorcycles as "mechanical horses". Have teams of them pull carriages, and detach when the extra load capacity isn't needed.
Pioneer the multiple-ratio, constant mesh, dog clutch-and-synchro gearbox, or promote epicyclics if possible.
Try to be indirect with a lot of it if possible, except for the key mental leaps of knowledge ("inspiration") and faith that would be needed. Just get the design rolling, suggest ways in which it could be better e.g. what if the gear teeth prescribed a spiral instead of being straight-cut? and let the other boffins figure it out. They're clever, they'll manage it. This way, the gaps in my knowledge aren't as fatal.
Then, aircraft. Zeppelins first, as the Montgolfiers already easily predate me, so it's just a case of strapping an engine and airscrew onto a balloon basket and letting it evolve from there. Make some gliders to modern-ish designs and convince OTHERS to do the test flights. Should those work, fill out the wings and frame somewhat, and fit a diesel or electric engine depending on how good the batteries have got.
After that, microscopes, and a sudden veering-off into the biological arts with a fervent attempt to demonstrate how dirt and germs can be shown to cause infection and disease.
Penicillin.
And maybe the extraction of DNA from cells, and the production of Nylon, if I can remember how to do those.
Hydrogen fuel cells, if I get the time. And Maglevs. And ECUs. And digital projectors, cameras, etc, and as many medical devices that I can dredge out of my memory. Particularly those that work with radio, magnetism, or nuclear forces. This may involve setting up a few rare-element mines.
Suggest the idea of putting an engine inside an armoured carriage fitted with continuous track-drive, and using this on the battlefield to carry an artilliery gun and some riflemen, protected as if in a mobile pillbox capable of moving cross-country faster than most men can run.
Keep all of it as secret as possible within the factory - particularly the engines, tanks, radio and computers - present it to the monarch (Victoria, or her father, depending on timing) and show how these things could be used to expand the empire all across europe, and then the world, bringing about peace in our time under the pax britannia. Never again shall the sun set on our tea and crumpets.
Hurrah! God save the *delete as appropriate*!