So clit pumps definitely can help with sensitivity, but they’re a bit annoying to get reliant on. ‘Orgasm balm’ can help too, it’s basically dilute menthol rub, that helps bring blood to the surface and so make you more sensitive.
The major advice I’d give you though is just to mix up what you’re doing first. Try some different positions, and most of all combining clit play with penetration/g-spot stimulation, and especially nipple play. You may find the whole is greater than the sum of the parts.
Also, read back on what I said about breathing for edging recently, and do the complete opposite! Use big breaths to build up ‘pressure’ as you edge harder, and try holding your breath when you’re really close to push yourself over.