I'm about 400k away from level 35
Leveling up earlier in the game was fun because you would actually get good stuff (incubator, eggs, lures etc), now you get some balls, some revives and you can level up your strong mons a little
I try to maximize my lucky eggs with evolve sprees. I haven't purchased any coins, so I just use my gym winnings. I mainly buy incubators, but rarely have more than two eggs cooking at a time. Would love another extra incubator event. The double xp event helped me quickly go from 33 to 34. It has been much slower since then, but I did buy more lucky eggs when they were on sale.
day to day, I try to catch almost everything and battle a few gyms. Slow and steady.