Right on point with the strategies. I use the same. My first time playing was almost impossible until I followed these strategies.
I would go for vehicles when there is a need and always try to fund the best one at that. I will go with anything if I don't have a choice.

About Stealth

Oh don't get me started, anytime I win the game I'm mostly in stealth mode. It limits my number of kills since I only go for the kill when I'm cornered and have no other option. Most at times be on stand by whiles others kill themselves whiles i loot the body, someone may call it cowardice but it is still a strategy and it works every time.

Grenades

I'm not a fan of grenades. I mostly avoid using them. I accidentally killed myself with it🤣 as well as exposing my team mates. So have been avoiding it's usage.

Random Shots & Landing Zone

Random shots are a good trap to set and effective when your team mates are good. I avoid it's usage when most of my team members are newbies. You set the trap and they will loitering around and get killed by it.
Right on point too with the landing zone, it's not about strapping up real fast or getting the best weapon. At the end of the day, it's winning that counts.

Thanks for sharing, i enjoyed reading as well as learnt a thing or 2 about the game.