It looks like it’s got a basic Suntour fork / 2x drivetrain with no clutch / budget wheels and fairly long seat tube heights vs the size (reach measurement not quoted on Halfords that I can see).
I’d be inclined to sell and buy a better one but it depends on budget. It’d probably be worth throwing on a Rockshox Recon air fork on that frame and do a budget 1×11 deore drivetrain, but you might be limited on dropper length by the tall seat tube and it looks like it has qr wheels at both ends so that’s not great from an upgrade potential.
What might your budget be if you sold the Voodoo? Stock of new bikes might be your issue.
With some careful buying of parts from different places I built the below bike for my nephew for £850. It’s not massively long or slack but the frame is probably an upgrade on the Bantu – better fork (Recon Gold 130mm Soloair with 15×110 axle), 1×11 Drivetrain with Deore Mech / SLX shifter / Sram chain / Sram crank and ring / Sunrace 11-46 cassette, Clarks M4 4pot brakes, Specialized tubeless tyres and custom wheels I built (Alex rims / Sapim spokes / Xt rear hub / Superstar V6 front hub). No dropper though in that budget.
He loves it and asking for a dropper for Christmas.