Or is it really, not about the bike…
It’s really really not about the bike.
unless you are racing at National+ level and keep dropping into 2nd or 3rd place by a marginal amount every time, then just possibly the incremental gains of a better* bike might help you gain that place back.
For anything else it’s the motor that’s holding you back and a better bike is going to at best give you a psychological boost, and maybe, just maybe help you gain a place, maybe, if everything else goes according to plan and you don’t cockup a corner again on the last lap…
having said all that, nice bikes are nice, and if you like it and have the £ then why not, it’ll bring you some enjoyment even if not a better placing, and you are riding for enjoyment aren’t you? 😉
I race on a cheap carbon XC bike with piddly little 26 inch wheels, top 10 in masters placer (well ~15 in sport now… grrr) in local/regionals and my bike is still more capable than me 🙂
In summary ride what you like and stop thinking about what other people think of it, just don’t expect it to magically catapult you up the rankings
* assuming you’re not currently racing on something wildly inappropriate or unreliable.