Favorite casual workout challenges? - eviltoast

I am semi-reguarly going to the gym (2-3x per week, depending on the week), and I decided to try a home workout challenge this week, adding 15 pushups every single week from Monday. At first I was doing sets of 15 but I’ve changed my style with time to minimize sets and maximize intensity.

Monday: 15 Tuesday: 15+15 (30) Wednesday: 15+15+15 (45) Thursday: 20+20+20 (60) Friday: 20+20+20+15 (75) Saturday: 20+20+15+15+10+10 (90)

Today I gotta do 105 and am considering how I want to approach it. Or, I can cap it at 100 and try to just do 100/day. Do you guys feel like it would be better to do 100/day or continue trying to increase my reps? Or perhaps I should start incorporating different pushup techniques (narrower hands, diamonds, lower hands, etc)?