JimTheCyclist I've just taken a look and the site seems to only just be failing LCP. Additionally, site speed is only one of hundreds of Google ranking factors, so I wouldn't get too caught up on these metrics and the idea it might hurt ranking. That said, if speed is a primary concern the one recommendation I'd have would be to turn on Leap script delay features and toggle on 'disable ads above the fold' (you can leave the rest of the settings off as you currently do) and this should contribute to better site speed. Do bear in mind it would also hurt revenue, so that's something to consider too.
You can try implementing other Leap recommendations too, like Imogen hinted at, but disabling above the fold ads would have the biggest impact.