Thank you for the advice. I currently play Necrons and Deathwatch, and I have over 2k points for both. I was planning on getting a five-model lot of Khorne Berzerkers to turn one of them into a Deathwatch marine and then sell the rest. It's part of a plan I have to create a kill team of traitor marines. Does it break lore? yes. Is it fun? Also yes. I was also considering getting a chaplain on a bike not only for his litanies, but so I can use a relic that teleports a unit to him.Glad to hear that you're thinking of sticking with it! Those sound like great goals and I think they're totally achievable. Hope you're able to be patient with yourself and not beat yourself up while trying, there's A LOT to learn about the game and it takes time. I've been playing it for years and still only have like a 50/50 win/loss rate.
I think focusing on secondaries and survivability are great places to start. The shift to incorporating secondaries into your strategies can be pretty tricky but really pays off. It's still something I struggle with, I learned to play in the day of "just blow everything off the table."
Survivability can also be really tough this edition since everything is super killy. The terrain rules and defensive placement are your friends, some armies can afford to be super aggressive and barrel up the board but most need to have a mix of that and being cagey.
A big part of winning matches too is knowing what your opponent's army is capable of. If you aren't already, I'd recommend chatting with them before had to get an idea of what their different units can do in terms of movement, damage output and toughness. Again battle reports are great for this too.
In terms of buying stuff, I think it's different for everyone. I usually only get stuff once or twice a year just because I already have so much stuff that I haven't finished painting. If not winning is having an impact on how much you're enjoying yourself, I'd focus on getting the stuff that'll make your army stronger and more fun to play.
What faction do you play and what are you looking to get?
The secondaries on securing objectives are hard for me since it either goes my guys get to it and then die, or I can't reach any and my opponent takes them and gets a **** ton of VP. This has led to me focusing on enemies on killing units instead of securing objectives.