money (you need enough) so keep dollar cost averaging into ETF, don't forget the world is a big place, so international as well and consider the debasement trade.
Switch to income investing when you "retire", don't try and time markets.
https://www.youtube.com/channel/UCuNKV0CMgcVUiJNdA-JNlJA
https://www.youtube.com/channel/UCxU4PhPfJEBgaeYT1rMhvCg
and physical health ; no smoking, no drinking, moderate cardio (running cycling etc) and lift weights to help prevent muscle loss and osteo.
and mental health: hike, enjoy the woods, spend time with friends and family you care for
Am 61, retired at 40 , gf is 57.