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You could try using a normal spade but there's a good chance you'll break it, so you might as well spend £20 on a mattock
https://bulldoghandtools.co.uk/bulldog-cutting-grubbing-mattock-handle-cm5set
Don't put it through your foot, or put your back out, or you'll wish you just left the stump alone
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Given you've got the holes already drilled, I'd burn it next.
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you will be able to dig that out without too much bother, albeit it will be moderately hard work.
you could do it with a spade only but that will add to the challenge. Spade plus an axe or a mattock by itself will make the job easier and less likely that you'll need to buy a new spade as part of the process.
I need to remove a stump from my front lawn; size 12 birkenstock for scale, I drilled a load of holes last spring to kill it off, which worked. Any tips for removal? I dont really want to buy a big axe becuase I know i'll never use it again.