Play in Invite Only or Solo Sessions until you level up to rank 20+. Then farm as many survival missions and survive to wave 10. Try to beat 3 wave 10 survival missions in 1 real hour = $60k. That should unlock higher ranks, improve your combat skills, give you superior weapons, armor, and cash all at the same time. Plus the fact you get to keep all the better weapons (MG, mini MG etc) until you quit online.
and yeah, if you see any white or red dots warping towards you on the map and your FM shooting skills suck, then
1. open your phone
2. join or host a race/mission/LTS/VS etc.
3. quit the session and find another session. This should buy you time to disappear into another mission marker on the map, put as much distance between yourself and the other dots on the map, or better yet, your new $60k garage you bought from the last 3 rounds of survival.