Hi Kyle,
Welcome to the community. Here's hoping that you'll enjoy your R/Cing for many more years to come.
Firstly, your Boost is an excellent first time RC car and it will serve you well as you grow into the hobby. Don't get disillusioned when results don't go your way and don't allow yourself to get caught up in any RC snobbery where you'll get convinced by others that you need to buy product X Y or Z. The ECX Boost is a basic but very robust 2WD buggy that follows the traditional and proven layout. It's not a cutting-edge top-flight race chassis - but it is more than enough for what you need right now (Remember that because there will be many who try to convince you otherwise). There may be other racers that will diss your Boost but don't let them get to you. You'll know when it's time to move on - don't get swayed by other peoples opinions - either online or at clubs.
Onto your Boost. You've already upgraded the Radio and motor - but have you changed the motor gearing? The Boost comes with a 20T motor and you've fitted a 15T so you'll need to adjust the gearing by fitting a smaller pinion gear. I'd suggest possibly 2-3 teeth smaller. Otherwise your new motor might get too hot because it will be over geared.
The Steering Servo fitted in the Boost is fairly slow in response for racing. One of the first upgrades I'd make in such a model is to fit a faster servo but again be careful. Today's top of the range servos can draw a lot of power and since they get their power through the ESC, you need to be careful not to fit one that is too powerful for your ESC. Your ESC is fitted with a 1 Amp BEC circuit so something like the Spektrum S6000 servo will offer you a decent speed increase over your existing unit without over powering the ESC and it'll not break the bank.
Make sure you get some tyres that suit the tracks you're racing at and really take it from there. Don't be afraid to ask questions at the club - most racers will be happy to help advise you. You don't need to spend fortunes to get a decent grin factor out of racing - especially when you're starting out. It's true that you'll end up spending more as you progress but equipment alone never won any race so don't be fooled. You'll soon start to understand what bits you need to concentrate on next once you get a few races under your belt.
Good Luck with it all.
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