Does VPS improve Core Web Vitals and should i upgrade to VPS ?

Hi guys,

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I'm using a local web hosting. I'm on their best wordpress plan : 14$/month (3GB of RAM and 6GHZ of CPU, they don't mention the number of vcores or cores, SSD, ..).

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I use Cloudflare pro, plus, agro. I have intalled WP Fastest Cache (premium).

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PageSpeedInsight shows a good index on computers (91-95), but poor speed on mobile (40).

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My website gets between 100k-150k visit per month. Some months i get a huge spike (500k visit). The only nightmare i'm facing with them is their SLA. I'm getting serious downtime that takes between 2h to 8 hours litteraly each month (except that day, the rest of the month is pretty fly).

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Today, when this happened for 3 hours, i asked their support about the reasons, they told me it's a node crash and they offered me to take my website to their new shared server. I kindly refused since this means alot of work especially on the cloudflare side (updating DNS, propagation..).

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Now I'm thinking about getting a VPS with these specs :

The first one :

• 4 GB Ram
• 2 vCores CPU
• 60 Gb Fast NVMe Hard Drive
• 200Mbps Bandwidth
• Unlimited traffic

The second one :

• 8 GB Ram
• 4 vCores CPU
• 80 Gb Fast NVMe Hard Drive
• 200Mbps Bandwidth
• Unlimited traffic

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I'm really eager to read your opinion about these specs, is it good ? will it improve my Page Speed Index on mobiles ? Should i really upgrade to VPS or i have to just stay on shared and accept their offer (migration to new server) ?

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Thank you very much.