If you’re finding the K1, P1 in the same st too difficult and want to experiment a little more, you could try kfb instead of K1, P1 in the same st (so kfb, kfb, k1 all in the same st, slide off left needle then turn and continue)…or…YO instead of the P st (so K1, YO, K again into same st, YO, K again into same st, slide off left needle then turn and continue).
If you want a bigger, poofier bobble, add an extra 2 or 4 rows before you decrease (so for 2 extra rows make the 5 stitches, turn, p5, turn, k5, turn, p5, turn, pass st 2-5, then k tbl - repeat to for 4 extra rows).
If you do your bobble in a different st, it will pop more, too - so if your background is stockinette, do reverse stockinette for your bobbles. This means after your first turn and you’re on the WS, you would knit that row, not purl - then purl the rows on the RS. After you decrease and move on to the next st, you would continue in stockinette (knitting on the RS and purling on the WS). Doing this method doesn’t change your initial row where you increased - i.e., you can still increase as directed and just begin your reverse stockinette on the first row after turning.