I've been put on a Personal Improvement Plan whilst on probation

Hello, I would love to ask for some advice as I have found myself in an incredibly stressful situation. I started a new role in account management having come from a completely different field (retail buying). When I was interviewing there was a junior role also available on the team, however it wasn't a role that I was after given the transferable skills and experience that I possess. Starting my role during lockdown has been challenging, however I feel like I have build strong relations with the team and have embraced the culture at my new company. Being that I am in a sales role, sales have been close to non existent during this period which has seen my team and the wider team under new levels of pressure for not delivering on this front. There is a long term view that my role was needed for company growth, however it leaves me having sleepless nights worrying about my future at my new company, particularly as I have now been put on an improvement plan. Feedback received on my reaction to this news was positive, I am doing my best to put on a brave front and embrace the opportunity to focus on a proper induction, but the truth is that I am incredibly worried, disappointed in myself and embarrassed that I haven't been able to show off that I can do this role effectively. The personal improvement plan came after I gave a presentation to my leadership team which lacked the conviction that they were after, as I was unclear of expectation from me and I very much missed the point by treated my assignment as an internal conversation exploring he different strategic options at hand (which is what was expected from me in my previous role). This one presentation has opened a can of worms and has really undermined my role in the company, with my new task at hand to prove myself within the team and ultimately to bring the sales which I was hired to deliver. I would love some advice on starting a role remotely, how you've been impressed by colleagues and employees, and what you've done to impress your teams. As said, I am showing a brave face for my improvement plan but it has personally been very disheartening. I have graded myself against the job spec and the key areas of improvement are around bringing in new clients which has been particularly difficult to do, with the team not getting any new business since the pandemic hit.