If you have a umatic deck, you need an interface/breakout box to trans-code the analog signal into a digital format.
Something like this:
https://www.markertek.com/product/bmd-int-shuttle/blackmagic-bintsshu-intensity-shuttle-10-bit-hd-sd-editing-solution-for-usb-3-0?utm_medium=shoppingengine&utm_source=googlebase&utm_source=google&utm_term=Product_Target&utm_campaign=Shopping+Top+Movers&utm_medium=cpc&utm_content=4fd2aB4f|pcrid|44234049020|pdv|c|&gclid=CKnPgIm-hcYCFQiQaQod8BcAjQ
You say 24 FPS, is the three-quarter inch tape shot in PAL or NTSC? You’d need a PAL version of the umatic deck to handle the euro format.
There are numerous cottage services that maintain these old decks and make transfers for you. If the footage is short, they’re usually more cost-effective than DIY solutions where you need to buy the deck and recondition it yourself.